curl: convert to new package scheme

Signed-off-by: Stephan Raue <stephan@openelec.tv>
libmicrohttpd: convert to new package scheme

Signed-off-by: Stephan Raue <stephan@openelec.tv>
yaml: convert to new package scheme

Signed-off-by: Stephan Raue <stephan@openelec.tv>
expat: convert to new package scheme

Signed-off-by: Stephan Raue <stephan@openelec.tv>
libxml2: convert to new package scheme

Signed-off-by: Stephan Raue <stephan@openelec.tv>
tinyxml: convert to new package scheme

Signed-off-by: Stephan Raue <stephan@openelec.tv>